v4.19.13 snapshot.
diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
new file mode 100644
index 0000000..992e8d8
--- /dev/null
+++ b/crypto/crypto_engine.c
@@ -0,0 +1,493 @@
+/*
+ * Handle async block request by crypto hardware engine.
+ *
+ * Copyright (C) 2016 Linaro, Inc.
+ *
+ * Author: Baolin Wang <baolin.wang@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <crypto/engine.h>
+#include <uapi/linux/sched/types.h>
+#include "internal.h"
+
+#define CRYPTO_ENGINE_MAX_QLEN 10
+
+/**
+ * crypto_finalize_request - finalize one request if the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ */
+static void crypto_finalize_request(struct crypto_engine *engine,
+ struct crypto_async_request *req, int err)
+{
+ unsigned long flags;
+ bool finalize_cur_req = false;
+ int ret;
+ struct crypto_engine_ctx *enginectx;
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ if (engine->cur_req == req)
+ finalize_cur_req = true;
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+ if (finalize_cur_req) {
+ enginectx = crypto_tfm_ctx(req->tfm);
+ if (engine->cur_req_prepared &&
+ enginectx->op.unprepare_request) {
+ ret = enginectx->op.unprepare_request(engine, req);
+ if (ret)
+ dev_err(engine->dev, "failed to unprepare request\n");
+ }
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ engine->cur_req = NULL;
+ engine->cur_req_prepared = false;
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ }
+
+ req->complete(req, err);
+
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
+}
+
+/**
+ * crypto_pump_requests - dequeue one request from engine queue to process
+ * @engine: the hardware engine
+ * @in_kthread: true if we are in the context of the request pump thread
+ *
+ * This function checks if there is any request in the engine queue that
+ * needs processing and if so call out to the driver to initialize hardware
+ * and handle each request.
+ */
+static void crypto_pump_requests(struct crypto_engine *engine,
+ bool in_kthread)
+{
+ struct crypto_async_request *async_req, *backlog;
+ unsigned long flags;
+ bool was_busy = false;
+ int ret;
+ struct crypto_engine_ctx *enginectx;
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+
+ /* Make sure we are not already running a request */
+ if (engine->cur_req)
+ goto out;
+
+ /* If another context is idling then defer */
+ if (engine->idling) {
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
+ goto out;
+ }
+
+ /* Check if the engine queue is idle */
+ if (!crypto_queue_len(&engine->queue) || !engine->running) {
+ if (!engine->busy)
+ goto out;
+
+ /* Only do teardown in the thread */
+ if (!in_kthread) {
+ kthread_queue_work(engine->kworker,
+ &engine->pump_requests);
+ goto out;
+ }
+
+ engine->busy = false;
+ engine->idling = true;
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+ if (engine->unprepare_crypt_hardware &&
+ engine->unprepare_crypt_hardware(engine))
+ dev_err(engine->dev, "failed to unprepare crypt hardware\n");
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ engine->idling = false;
+ goto out;
+ }
+
+ /* Get the fist request from the engine queue to handle */
+ backlog = crypto_get_backlog(&engine->queue);
+ async_req = crypto_dequeue_request(&engine->queue);
+ if (!async_req)
+ goto out;
+
+ engine->cur_req = async_req;
+ if (backlog)
+ backlog->complete(backlog, -EINPROGRESS);
+
+ if (engine->busy)
+ was_busy = true;
+ else
+ engine->busy = true;
+
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+ /* Until here we get the request need to be encrypted successfully */
+ if (!was_busy && engine->prepare_crypt_hardware) {
+ ret = engine->prepare_crypt_hardware(engine);
+ if (ret) {
+ dev_err(engine->dev, "failed to prepare crypt hardware\n");
+ goto req_err;
+ }
+ }
+
+ enginectx = crypto_tfm_ctx(async_req->tfm);
+
+ if (enginectx->op.prepare_request) {
+ ret = enginectx->op.prepare_request(engine, async_req);
+ if (ret) {
+ dev_err(engine->dev, "failed to prepare request: %d\n",
+ ret);
+ goto req_err;
+ }
+ engine->cur_req_prepared = true;
+ }
+ if (!enginectx->op.do_one_request) {
+ dev_err(engine->dev, "failed to do request\n");
+ ret = -EINVAL;
+ goto req_err;
+ }
+ ret = enginectx->op.do_one_request(engine, async_req);
+ if (ret) {
+ dev_err(engine->dev, "Failed to do one request from queue: %d\n", ret);
+ goto req_err;
+ }
+ return;
+
+req_err:
+ crypto_finalize_request(engine, async_req, ret);
+ return;
+
+out:
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+}
+
+static void crypto_pump_work(struct kthread_work *work)
+{
+ struct crypto_engine *engine =
+ container_of(work, struct crypto_engine, pump_requests);
+
+ crypto_pump_requests(engine, true);
+}
+
+/**
+ * crypto_transfer_request - transfer the new request into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+static int crypto_transfer_request(struct crypto_engine *engine,
+ struct crypto_async_request *req,
+ bool need_pump)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+
+ if (!engine->running) {
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ return -ESHUTDOWN;
+ }
+
+ ret = crypto_enqueue_request(&engine->queue, req);
+
+ if (!engine->busy && need_pump)
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
+
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ return ret;
+}
+
+/**
+ * crypto_transfer_request_to_engine - transfer one request to list
+ * into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+static int crypto_transfer_request_to_engine(struct crypto_engine *engine,
+ struct crypto_async_request *req)
+{
+ return crypto_transfer_request(engine, req, true);
+}
+
+/**
+ * crypto_transfer_ablkcipher_request_to_engine - transfer one ablkcipher_request
+ * to list into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ * TODO: Remove this function when skcipher conversion is finished
+ */
+int crypto_transfer_ablkcipher_request_to_engine(struct crypto_engine *engine,
+ struct ablkcipher_request *req)
+{
+ return crypto_transfer_request_to_engine(engine, &req->base);
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_ablkcipher_request_to_engine);
+
+/**
+ * crypto_transfer_aead_request_to_engine - transfer one aead_request
+ * to list into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+int crypto_transfer_aead_request_to_engine(struct crypto_engine *engine,
+ struct aead_request *req)
+{
+ return crypto_transfer_request_to_engine(engine, &req->base);
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_aead_request_to_engine);
+
+/**
+ * crypto_transfer_akcipher_request_to_engine - transfer one akcipher_request
+ * to list into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+int crypto_transfer_akcipher_request_to_engine(struct crypto_engine *engine,
+ struct akcipher_request *req)
+{
+ return crypto_transfer_request_to_engine(engine, &req->base);
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_akcipher_request_to_engine);
+
+/**
+ * crypto_transfer_hash_request_to_engine - transfer one ahash_request
+ * to list into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine,
+ struct ahash_request *req)
+{
+ return crypto_transfer_request_to_engine(engine, &req->base);
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_hash_request_to_engine);
+
+/**
+ * crypto_transfer_skcipher_request_to_engine - transfer one skcipher_request
+ * to list into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+int crypto_transfer_skcipher_request_to_engine(struct crypto_engine *engine,
+ struct skcipher_request *req)
+{
+ return crypto_transfer_request_to_engine(engine, &req->base);
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_skcipher_request_to_engine);
+
+/**
+ * crypto_finalize_ablkcipher_request - finalize one ablkcipher_request if
+ * the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ * TODO: Remove this function when skcipher conversion is finished
+ */
+void crypto_finalize_ablkcipher_request(struct crypto_engine *engine,
+ struct ablkcipher_request *req, int err)
+{
+ return crypto_finalize_request(engine, &req->base, err);
+}
+EXPORT_SYMBOL_GPL(crypto_finalize_ablkcipher_request);
+
+/**
+ * crypto_finalize_aead_request - finalize one aead_request if
+ * the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ */
+void crypto_finalize_aead_request(struct crypto_engine *engine,
+ struct aead_request *req, int err)
+{
+ return crypto_finalize_request(engine, &req->base, err);
+}
+EXPORT_SYMBOL_GPL(crypto_finalize_aead_request);
+
+/**
+ * crypto_finalize_akcipher_request - finalize one akcipher_request if
+ * the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ */
+void crypto_finalize_akcipher_request(struct crypto_engine *engine,
+ struct akcipher_request *req, int err)
+{
+ return crypto_finalize_request(engine, &req->base, err);
+}
+EXPORT_SYMBOL_GPL(crypto_finalize_akcipher_request);
+
+/**
+ * crypto_finalize_hash_request - finalize one ahash_request if
+ * the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ */
+void crypto_finalize_hash_request(struct crypto_engine *engine,
+ struct ahash_request *req, int err)
+{
+ return crypto_finalize_request(engine, &req->base, err);
+}
+EXPORT_SYMBOL_GPL(crypto_finalize_hash_request);
+
+/**
+ * crypto_finalize_skcipher_request - finalize one skcipher_request if
+ * the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ */
+void crypto_finalize_skcipher_request(struct crypto_engine *engine,
+ struct skcipher_request *req, int err)
+{
+ return crypto_finalize_request(engine, &req->base, err);
+}
+EXPORT_SYMBOL_GPL(crypto_finalize_skcipher_request);
+
+/**
+ * crypto_engine_start - start the hardware engine
+ * @engine: the hardware engine need to be started
+ *
+ * Return 0 on success, else on fail.
+ */
+int crypto_engine_start(struct crypto_engine *engine)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+
+ if (engine->running || engine->busy) {
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ return -EBUSY;
+ }
+
+ engine->running = true;
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_engine_start);
+
+/**
+ * crypto_engine_stop - stop the hardware engine
+ * @engine: the hardware engine need to be stopped
+ *
+ * Return 0 on success, else on fail.
+ */
+int crypto_engine_stop(struct crypto_engine *engine)
+{
+ unsigned long flags;
+ unsigned int limit = 500;
+ int ret = 0;
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+
+ /*
+ * If the engine queue is not empty or the engine is on busy state,
+ * we need to wait for a while to pump the requests of engine queue.
+ */
+ while ((crypto_queue_len(&engine->queue) || engine->busy) && limit--) {
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ msleep(20);
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ }
+
+ if (crypto_queue_len(&engine->queue) || engine->busy)
+ ret = -EBUSY;
+ else
+ engine->running = false;
+
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+ if (ret)
+ dev_warn(engine->dev, "could not stop engine\n");
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_engine_stop);
+
+/**
+ * crypto_engine_alloc_init - allocate crypto hardware engine structure and
+ * initialize it.
+ * @dev: the device attached with one hardware engine
+ * @rt: whether this queue is set to run as a realtime task
+ *
+ * This must be called from context that can sleep.
+ * Return: the crypto engine structure on success, else NULL.
+ */
+struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
+{
+ struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
+ struct crypto_engine *engine;
+
+ if (!dev)
+ return NULL;
+
+ engine = devm_kzalloc(dev, sizeof(*engine), GFP_KERNEL);
+ if (!engine)
+ return NULL;
+
+ engine->dev = dev;
+ engine->rt = rt;
+ engine->running = false;
+ engine->busy = false;
+ engine->idling = false;
+ engine->cur_req_prepared = false;
+ engine->priv_data = dev;
+ snprintf(engine->name, sizeof(engine->name),
+ "%s-engine", dev_name(dev));
+
+ crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN);
+ spin_lock_init(&engine->queue_lock);
+
+ engine->kworker = kthread_create_worker(0, "%s", engine->name);
+ if (IS_ERR(engine->kworker)) {
+ dev_err(dev, "failed to create crypto request pump task\n");
+ return NULL;
+ }
+ kthread_init_work(&engine->pump_requests, crypto_pump_work);
+
+ if (engine->rt) {
+ dev_info(dev, "will run requests pump with realtime priority\n");
+ sched_setscheduler(engine->kworker->task, SCHED_FIFO, ¶m);
+ }
+
+ return engine;
+}
+EXPORT_SYMBOL_GPL(crypto_engine_alloc_init);
+
+/**
+ * crypto_engine_exit - free the resources of hardware engine when exit
+ * @engine: the hardware engine need to be freed
+ *
+ * Return 0 for success.
+ */
+int crypto_engine_exit(struct crypto_engine *engine)
+{
+ int ret;
+
+ ret = crypto_engine_stop(engine);
+ if (ret)
+ return ret;
+
+ kthread_destroy_worker(engine->kworker);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_engine_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Crypto hardware engine framework");